On your laptop keyboard, see if there is a function key on the button-left of the keyboard, plus one F something with a logo that looks like a computer screen. For example, on mine which is a HP Pavilion, it is the key Function + F4.

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After connecting the projector ( or any other external display ), you need to tell the laptop to toggle the display to the external one, not the laptop screen.To do that, you can press the ( Fn key + F7 ).Some times, it's F4, regarding the laptop.

Connect your projector to your laptop using a VGA cable. Now turn ON your projector and your laptop.

To make your screen projected, look at your function keys (F1 to F12). Look for the icon which looks like a laptop LCD and a TV. It should appear like LCD icon/TV icon. In some model it is in F4 while F3 in Lenovo. Example, you found the icon in F4, just press and hold down the FN key and press F4 to send your desktop image to the projector. This combination is called the "dual monitor" setup which in your case, the second monitor is a digital projector.

If your dell is equipped to do this it is on the back side and appears as a video card connector or s-Video out. It is possible that your Dell is not equipped to make this connection, I have found a few that are not.

on your display properties, switch windows to appear on your laptop. and do not connect your LCD when booting your PC. there is an option in display property that says extened your windows to this display... that is your LCD.